Projectile.



B. PRIEDRIOK.

PROJEGTILE.

APPLICATION FILED 11110. 21, 1911.

1 ,O40,924;, Patented Oct. 8, 1912.

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E ornrcn.

PnoJEcTILE.

increase.

' Specification of Letters Patent. Patented Oct. 8, 1912.

Application filed December 21; 1911. Serial No. 667,123.

To all whom it may concern:

Be it known that I, ERNEST FRIEDRICK, lieutenant United States Navy, and a citizen of the United States, at present stationed at the works of E. W. Bliss Company, Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Projectiles; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to projectiles, and has for its object to lessen the cost of the manufacture of standard projectiles, and at the same time to secure the rotating band more firmly in its seat, while preventing leakage.

of gases past the same.

To these ends, the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claims.

Referring to the accompanying drawings forming a part of this specification, in which the figure is a diagrammatic sectional View of a projectile made in accordance with my invention 1 indicates the body of the projectile, which may be of any desired or approved contour, 2 the base thereof, and 3 any suitable fuse device secured in said base.

The base portion 2 is provided with a reduced screw-threaded forward portion 4, which is secured in the correspondingly screw-threaded rear portion 5 of the projectile, and said base portion is further scored out as at 6, to form a seat for the rotating band 7. The seat 6 is provided with the overhanging lip 8, and the rear portion 5 of the projectile is provided with the overhanging lip 9, while the band 7 is correspondingly beveled, as at 10 and 11, to fit under said lips when the parts are in their operative position. A gasket 12, shown in the drawings as greatly exaggerated, may be placed between the parts 1 and 2, in order to cause the band 7 to be more firmly gripped and to further prevent leakage of gases 1nto' the powder chamber.

As is well known, the forged steel projectiles manufactured at the present time have the rotating band 7 pressed into a groove in the projectile by hydraulic pressure, and the metal of the band is, therefore, usually in a state of compression, or nearly so. By my invention, however, when the parts are set up firmly, the metal of the band is really in a state of tension, and it therefore grips the shell harder, and is less likely to fly oif than are the bands now in use. A band fitted in accordance with my invention will further seal the bore of the-gun more tightly during the firing, for they are capable of expanding to a greater degree than are the old bands, as will now appear.

In making my projectile, after the completion of the base portion 2-, the copper band 7 is machined to a size slightly smaller than the diameter of its seat 6, when it is pressed home tight by any suitable means, and the bandis then machined to the exact size, with an allowance of say .031 inches on the forward end, where it takes up against the projection 9 of the shell. This will cause a space 12 to be left, of say .031 inches, between the base 2 and the body 1 of the shell.

The screw-threads are in such a direction that they will tend to tighten upon firing, and the inertia of the forward end of the projectile will cause the base 2 to screw up, thus forcing the rotating band radially outward into the rifiing, and thereby reducing the leakage of gas past the shell.

Less leakage of gas will result in an increased velocity of the projectile, a perfectly functioning band prevents stripping, as is now experienced to some extent, and since the sections 1 and 2 of the shell may be tempered independently, a better fragmentation of the shell can be secured. In fact, a shell made in accordance with my invention is well adapted for use as shrapnel. Further, since the joint between the base and the forward portion of the shell is located forward of the band 7, there is no danger of the gases of explosion working their way to the interior of the shell, and thereupon causing a premature explosion.

It is obvious that those skilled in the art may vary the details of construct-ion and the arrangement of parts without departing from the spirit of my invention, and there fore I do not wish to be limited to the above disclosure, except as may be required by the claims.

What I claim is 1. Ina projectile the combination of a hollow screw-threaded forward. portion provided with an undercut outer rim; a reduced lips,-

Copies ofth'is patent may beobtained for five cents each, by addressing the Commissioner of Patents,

base portion screw threaded to fit said for- I ward portion and provided with a larger portion having an undercut open seat for a and; and a band beveled at its rear edge fitting said seat, extending a slight distance beyond the edge of said larger portion, and its forward edge adapted to fit said undercut rim, said band also adapted to be forced radially outward when the said forward and base portions are forced together, substan tially as described, i I" r r 2. In la projectile, the combination of a hollow screw threadedforwa'rd portion having an under cut lip, and a straight shoulder portion between ,said lip and screw threaded portion; abase portion screw threaded to fit said forward portion, having an open ended seatfor a band, an under out portion to re-. ceive said band, and-a straight shoulder:por tion between the open end of said seat and said screw threaded portion and a band located in said seat/fitting, ,saidundercut and .-extending slightly beyond: the shoulder portion ofisaid base in order'f'that it may beforced radially outward upon forcing the parts together substantially described. I 3. In a projectile the comblnatlon of a forward portion having a screw-threaded end; a base portion provided with an open ended seatfior a band, said base portlon also provided with a reduced screw-threaded por tion adapted to fit the screw-threaded end of said forward portion; a band fitting said seat and projection slightly over the open end of the same to form-a space between said forward and base portionsflwhen ,thejlatter are united; and a gasket located in thespace WVILLIAM O. GREENE, v, GENEVIEVE B. FULTONQ Washington, I). C. 

